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Hey, I had a 4 channel amp installed and since the installation the check engine light came on and will not clear out. It is throwing the O2 sensor code. What could be wrong? Could it just be a strange coincidence that the sensor went bad at the exact time the amp was installed? Of course best buy claims they did nothing to affect it but the dealer tried to reset the code and it will not clear. Also, since then the ECO light on the dash never some on, so I assume they are related. Please help!!!